package thinkinjava1.ch14;

import java.applet.Applet;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.concurrent.TimeUnit;

/**
 * Created by BobbyGu on 2017/2/27.
 */
class Ticker2 extends Thread {
    private Button
            b = new Button("Toggle"),
            incPriority = new Button("up"),
            decPriority = new Button("down");
    private TextField
            t = new TextField(10),
            pr = new TextField(3); // Display priority
    private int count = 0;
    private boolean runFlag = true;

    public Ticker2(Container c) {
        b.addActionListener(new ToggleL());
        incPriority.addActionListener(new UpL());
        decPriority.addActionListener(new DownL());
        Panel p = new Panel();
        p.add(t);
        p.add(pr);
        p.add(b);
        p.add(incPriority);
        p.add(decPriority);
        c.add(p);
    }

    class ToggleL implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            runFlag = !runFlag;
        }
    }

    class UpL implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            int newPriority = getPriority() + 1;
            if (newPriority > Thread.MAX_PRIORITY)
                newPriority = Thread.MAX_PRIORITY;
            setPriority(newPriority);
        }
    }

    class DownL implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            int newPriority = getPriority() - 1;
            if (newPriority < Thread.MIN_PRIORITY)
                newPriority = Thread.MIN_PRIORITY;
            setPriority(newPriority);
        }
    }

    public void run() {
        while (true) {
            if (runFlag) {
                t.setText(Integer.toString(count++));
                pr.setText(
                        Integer.toString(getPriority()));
            }
            try {
                TimeUnit.MILLISECONDS.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

public class Counter5 extends Applet {
    private Button
            start = new Button("Start"),
            upMax = new Button("Inc Max Priority"),
            downMax = new Button("Dec Max Priority");
    private boolean started = false;
    private static final int SIZE = 10;
    private Ticker2[] s = new Ticker2[SIZE];
    private TextField mp = new TextField(3);

    public void init() {
        for (int i = 0; i < s.length; i++)
            s[i] = new Ticker2(this);
        add(new Label("MAX_PRIORITY = "
                + Thread.MAX_PRIORITY));
        add(new Label("MIN_PRIORITY = "
                + Thread.MIN_PRIORITY));
        add(new Label("Group Max Priority = "));
        add(mp);
        add(start);
        add(upMax);
        add(downMax);
        start.addActionListener(new StartL());
        upMax.addActionListener(new UpMaxL());
        downMax.addActionListener(new DownMaxL());
        showMaxPriority();
// Recursively display parent thread groups:
        ThreadGroup parent =
                s[0].getThreadGroup().getParent();
        while (parent != null) {
            add(new Label(
                    "Parent threadgroup max priority = "
                            + parent.getMaxPriority()));
            parent = parent.getParent();
        }
    }

    public void showMaxPriority() {
        mp.setText(Integer.toString(
                s[0].getThreadGroup().getMaxPriority()));
    }

    class StartL implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            if (!started) {
                started = true;
                for (int i = 0; i < s.length; i++)
                    s[i].start();
            }
        }
    }

    class UpMaxL implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            int maxp =
                    s[0].getThreadGroup().getMaxPriority();
            if (++maxp > Thread.MAX_PRIORITY)
                maxp = Thread.MAX_PRIORITY;
            s[0].getThreadGroup().setMaxPriority(maxp);
            showMaxPriority();
        }
    }

    class DownMaxL implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            int maxp =
                    s[0].getThreadGroup().getMaxPriority();
            if (--maxp < Thread.MIN_PRIORITY)
                maxp = Thread.MIN_PRIORITY;
            s[0].getThreadGroup().setMaxPriority(maxp);
            showMaxPriority();
        }
    }

    public static void main(String[] args) {
        Counter5 applet = new Counter5();
        Frame aFrame = new Frame("Counter5");
        aFrame.addWindowListener(
                new WindowAdapter() {
                    public void windowClosing(WindowEvent e) {
                        System.exit(0);
                    }
                });
        aFrame.add(applet, BorderLayout.CENTER);
        aFrame.setSize(300, 600);
        applet.init();
        applet.start();
        aFrame.setVisible(true);
    }
}
